Q.
A sound source emits sound waves in a uniform medium. If energy density is $E$ and maximum speed of the particles of the medium is $v_{\max}.$ The plot between $E$ and $v_{\max}\ $is best represented by
A)
B)
C)
D)
Explanation
(c) Energy density $(E) = \frac{I}{v} = 2\pi^{2}\rho n^{2}A^{2}$
$v_{\max} = \omega A = 2\pi nA \Rightarrow E \propto \left( v_{\max} \right)^{2}$
$i.e.,$ graph between $E$ and $v_{\max}$ will be parabola symmetrical about $E$ axis
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.